Wasp Explodes in Wasp Zapper

Info from Licensor: "We have a wasp problem in our garden, wasps are a serious threat in New Zealand as they destroy our native insects. The wasp nest is underground. I did install the grid above the nest during the night. The wasp zapper runs on 5600 Volts DC supplied via a microwave oven transformer and voltage doubler. An overhead line supported on small power poles supplies the circuit."